Quick Answer
1 calorie equals 0.00396567 btu. To convert calories to btu, multiply the value by this factor.
Key Facts
- Reverse: 1 British thermal unit = 252.164 calories.
Calories to BTU Converter
Free instant cal → BTU converter. No signup, no uploads — everything is calculated privately in your browser.
1 cal = 0.00396567 btu
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Calories to BTU Formula
Formula: value ÷ 252.164
Prefer to skip the math? Type any value in the converter above and it converts instantly.
Calories to BTU Conversion Table
| Calories (cal) | BTU (BTU) |
|---|---|
| 1 cal | 0.00396567 BTU |
| 2 cal | 0.00793133 BTU |
| 5 cal | 0.0198283 BTU |
| 10 cal | 0.0396567 BTU |
| 25 cal | 0.0991417 BTU |
| 50 cal | 0.198283 BTU |
| 100 cal | 0.396567 BTU |
| 250 cal | 0.991417 BTU |
| 500 cal | 1.98283 BTU |
| 1,000 cal | 3.96567 BTU |
Frequently Asked Questions
How do I convert calories to btu?
Enter the value above and the result appears instantly — the calculation runs entirely in your browser. Formula: value ÷ 252.164.
What is the exact calories to btu conversion factor?
1 calorie = 0.00396567 btu (shown to 6 significant figures — the converter itself computes at full precision). The reverse factor is 1 British thermal unit = 252.164 calories.
What are some common calories to btu conversions?
1 cal = 0.00396567 BTU; 10 cal = 0.0396567 BTU; 100 cal = 0.396567 BTU. Use the full conversion table below for more reference values.
Is a calorie the same as a food Calorie?
No — and the capital letter matters. A food Calorie (with a capital C) is a kilocalorie: 1,000 small calories. This converter treats them correctly: 1 kcal = 4.184 kJ = 1,000 cal. Energy labels on food almost always mean kilocalories, even where the label just says "calories".
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